A yearly accounting package for businesses with a turnover of up to 20L and GST registration could include the following services:

1. Bookkeeping: Recording all financial transactions in the appropriate ledger accounts, such as sales, purchases, expenses, and cash transactions. This includes maintaining the General Ledger, Accounts Receivable, and Accounts Payable.

2. GST Return Filing: Preparing and filing GST returns on a monthly or quarterly basis, depending on the business's turnover. This includes reconciling GST payments and filing of returns.

3. GST Reconciliation: Reconciling GST returns with the books of accounts to ensure that there are no discrepancies between the GST returns and the financial statements.

4. Digital Tax Payment: Facilitating digital payments of GST, TDS, and other applicable taxes on time.

5. Financial Statements: Preparing financial statements such as profit and loss statement, balance sheet, and cash flow statement, which provide an overview of the business's financial performance.

6. Business Insights and Analysis: Providing insights and analysis on financial performance, identifying areas of opportunity, and highlighting any concerns or risks.

7. Compliance Management: Assisting with compliance management, such as maintaining records of statutory compliances, ensuring timely filing of returns, and assisting with compliance audits.

Overall, the yearly accounting package for businesses with up to 20L turnover and GST registration includes a comprehensive range of services to manage financial transactions, ensure tax compliance, and provide valuable business insights. It also includes GST reconciliation to ensure that there are no discrepancies between the GST returns and the financial statements.